diff --git a/addons/mail/mail_thread.py b/addons/mail/mail_thread.py
index 97abd6050e8..633132583ed 100644
--- a/addons/mail/mail_thread.py
+++ b/addons/mail/mail_thread.py
@@ -1583,7 +1583,7 @@ class mail_thread(osv.AbstractModel):
                 if context.get('operation', '') == 'create':
                     self.check_access_rule(cr, uid, ids, 'create')
                 else:
-                self.check_access_rule(cr, uid, ids, 'read')
+                    self.check_access_rule(cr, uid, ids, 'read')
             except (osv.except_osv, orm.except_orm):
                 return False
         else: